Dehydrogenation of α-Amino Acids Chelated to a Co(III) Ion Yielding α-Imino Acidato Complexes

The oxidation of the α-amino acidato cobalt(III) complexes with 2,3,2-tet (=3,7-diazanonane-1,9-diamine) or its derivative, where amino acidate ligand was phenylglycinate, alaninate, valinate N-methylalaninate, or prolinate, by potassium permanganate was achieved to yield the corresponding α-imino acidato complexes, [CoIII{N(R1)=C(R2)CO2}(N4)]2+.